Results: No notable change with / without changes to bb's configuration concerning wallpaper.

Concussion:

I believe it would be possible to do this with vlc, and a simple plugin that accesses the cli specifically. most windows machines are capable of using --video-wallpaper option. im not a programmer, but i would certainly test this for you.

Another option would be to release a build with the wallpaper code disabled... unless this is a part of the core api.

Final thoughts:

the entire purpose of this experiment of mine, was to build an extremely simple UI for small children. Kids like flash... we all know. (Potential additional usage {track mouse movement, and use coords to update a script that controls wallpaper, kinda like a bubble around the pointer}; though this might be very cpu/gpu intensive. Decrease sample rates Or size of effect/effected area to draw?).